Uber is eliminating about 3,700 full-time positions from its customer support and recruiting teams, about 14 percent of its workforce, the company reported in a filing with the U.S. Securities and Exchange Commission. Uber CEO Dara Khosrowshahi also has agreed to waive his base salary for the rest of this year. The company, which already has instituted a hiring freeze, cited "lower trip volumes" in the decision to eliminate the positions in the filing.